chore: upgrade OpenAI default model to gpt-5.2

mcp/openai_client.go

@@ -7,7 +7,7 @@ import (
 const (
 	ProviderOpenAI       = "openai"
 	DefaultOpenAIBaseURL = "https://api.openai.com/v1"
-	DefaultOpenAIModel   = "gpt-5.1"
+	DefaultOpenAIModel   = "gpt-5.2"
 )
 
 type OpenAIClient struct {

web/src/components/AITradersPage.tsx

@@ -69,7 +69,7 @@ const AI_PROVIDER_CONFIG: Record<string, {
     apiName: 'Alibaba Cloud',
   },
   openai: {
-    defaultModel: 'gpt-5.1',
+    defaultModel: 'gpt-5.2',
     apiUrl: 'https://platform.openai.com/api-keys',
     apiName: 'OpenAI',
   },